IST to BTT Time Converter

Convert India Standard Time (IST) to Bhutan Time (BTT). Both time zones are shown live below; current offset between them is 0h 30m ahead.

Mumbai · India Standard Time
20:48:51
Wednesday, May 13, 2026
GMT+5:30 · UTC+05:30
Thimphu · Bhutan Time
21:18:51
Wednesday, May 13, 2026
GMT+6 · UTC+06:00

Convert a specific time

From: IST (Mumbai)
To: BTT (Thimphu)
--:--

Daylight Saving status right now

IST (India Standard Time)
Observes DST
No
BTT (Bhutan Time)
Observes DST
No

When can IST and BTT meet?

00
01
02
03
04
05
06
07
08
09
10
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13
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IST
BTT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Mumbai (IST). Each row shows the local working-hours state in that zone for the same moment in time.
8 hours of overlap during standard 9am-5pm working hours.
Best meeting window: 09:00–16:00 IST (09:30–16:30 BTT).

Hour-by-hour IST to BTT conversion table

IST time (Mumbai)BTT time (Thimphu)Status
00:00 Wed00:30 WedOff-hours both sides
01:00 Wed01:30 WedOff-hours both sides
02:00 Wed02:30 WedOff-hours both sides
03:00 Wed03:30 WedOff-hours both sides
04:00 Wed04:30 WedOff-hours both sides
05:00 Wed05:30 WedOff-hours both sides
06:00 Wed06:30 WedOff-hours both sides
07:00 Wed07:30 WedOff-hours both sides
08:00 Wed08:30 WedOff-hours both sides
09:00 Wed09:30 WedBoth at work
10:00 Wed10:30 WedBoth at work
11:00 Wed11:30 WedBoth at work
12:00 Wed12:30 WedBoth at work
13:00 Wed13:30 WedBoth at work
14:00 Wed14:30 WedBoth at work
15:00 Wed15:30 WedBoth at work
16:00 Wed16:30 WedBoth at work
17:00 Wed17:30 WedOff-hours both sides
18:00 Wed18:30 WedOff-hours both sides
19:00 Wed19:30 WedOff-hours both sides
20:00 Wed20:30 WedOff-hours both sides
21:00 Wed21:30 WedOff-hours both sides
22:00 Wed22:30 WedOff-hours both sides
23:00 Wed23:30 WedOff-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

India Standard Time (IST)
IANA identifier
Asia/Kolkata
Current UTC offset
UTC+05:30
Current abbreviation
GMT+5:30
Major cities in this zone
MumbaiNew DelhiBangaloreChennaiKolkata
Bhutan Time (BTT)
IANA identifier
Asia/Thimphu
Current UTC offset
UTC+06:00
Current abbreviation
GMT+6
Major cities in this zone
Thimphu

Sun today in Mumbai and Thimphu

Mumbai
Sunrise
06:06
Sunset
19:06
Solar noon
12:36
Daylight
13h 0m

Related converters

BTT to IST (reverse)IST to ESTIST to PSTIST to GMTIST to UTCIST to CETEST to BTTPST to BTTGMT to BTTUTC to BTTCET to BTT
Looking for local time? See time in Mumbai or time in Thimphu.

Frequently asked questions

What is the time difference between IST and BTT right now?+
BTT (Bhutan Time) is currently 0h 30m ahead IST (India Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does IST or BTT observe daylight saving time?+
IST: does not observe daylight saving time. BTT: does not observe daylight saving time.
When is the best time to schedule a meeting between IST and BTT?+
The strongest overlap is 09:00–16:00 IST (09:30–16:30 BTT), giving 8 hours when both sides are within standard 9am-5pm working hours.
What time is it in Thimphu when it is 12:00 noon in Mumbai?+
When it is 12:00 Wed in Mumbai (IST), it is 12:30 Wed in Thimphu (BTT).
Which IANA time zone identifiers are used for IST and BTT?+
IST maps to "Asia/Kolkata" in the IANA database. BTT maps to "Asia/Thimphu". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Mumbai ahead of or behind Thimphu?+
Whether Mumbai (IST) is ahead of or behind Thimphu (BTT) depends on the current UTC offsets. Right now BTT is 0h 30m ahead IST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for IST and BTT?+
IST is UTC+05:30 (GMT+5:30) and BTT is UTC+06:00 (GMT+6). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both IST and BTT?+
Yes. There are 8 hours of overlap during standard 9am-5pm working hours, with the strongest window at 09:00–16:00 IST.